I think you better talk to either a lawyer or a law enforcement official before you decide to take the car back. If they have paperwork that says you sold it to them, you're liable for grand theft. Even if you have paper work saying it's yours. You have obviously already dealt with the courts and probably stated you sold it to them, so that;s on record already.
Not what you want to deal with with a pregnant wife around. I'm not sure about your state, but here you sign the back of the title when you sell a car and that's the bill of sale. If they have paper work with your signature on it, you're hooped if you just "take the car back".
As to the tickets, the car may still be legally registered in your name, but if you sold it and have proof, they are liable. We have to notify the dmv that the car has been sold, but it's usually done when the new owner registers the car. How can you at least not know thier names? You may have to go to small claims court to prove it wasn't you and get your money back, but you can get it back, legally.
I'd be more inclined to go take the plate off the car so it doesn't accumulate any more tickets in your name rather than take the whole thing and risk arrest.
Just be really careful in this situ, nothing pisses people off and makes them look for vengance (again, preganant wife, you want that kind of hassle right now) than a stolen car.
Talk to someone in the legal system about your options before you do this.
PS I'd be careful posting this stuff on the net too, I know of a couple cases where the lawyer found an individual talking about lying in court to get away with something. It was printed off, shown to the judge and buddy got REALLY hooped.
Let me see if I can find it.
Ah Ha! Here it is:
Look at the fifth post. The net just got a little smaller...........